@misc{indiciaebd0a4c2b2394,
  title = {Petroleum potential of wilderness lands in Colorado},
  author = {Charles Winthrop Spencer},
  year = {1983},
  doi = {10.3133/cir902e},
  url = {https://pubs.usgs.gov/publication/cir902E},
  note = {Source identifier: cir902E}
}